Microstructural　control　of　matrix　is　a　critical　way　to　improve　the　emission　properties　of　cathode.　In　this　work,　microwave　sintering　strategy　was　developed　to　fabricate　W-Ir　alloy　matrix　with　uniform　grain　size.　The　maximum　of　zero-field　current　density　was　measured　to　be　17.30　A/cm(2)　at　1050　degrees　Cb,　which　is　superior　to　M　type　cathode　coated　with　Ir　and　It-Re-W　films.